18908199473 has 2 divisors, whose sum is σ = 18908199474. Its totient is φ = 18908199472.

The previous prime is 18908199449. The next prime is 18908199533. The reversal of 18908199473 is 37499180981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9639901489 + 9268297984 = 98183^2 + 96272^2 .

It is a cyclic number.

It is not a de Polignac number, because 18908199473 - 2¹⁸ = 18907937329 is a prime.

It is not a weakly prime, because it can be changed into another prime (18908199403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9454099736 + 9454099737.

It is an arithmetic number, because the mean of its divisors is an integer number (9454099737).

Almost surely, 2^18908199473 is an apocalyptic number.

It is an amenable number.

18908199473 is a deficient number, since it is larger than the sum of its proper divisors (1).

18908199473 is an equidigital number, since it uses as much as digits as its factorization.

18908199473 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3919104, while the sum is 59.

The spelling of 18908199473 in words is "eighteen billion, nine hundred eight million, one hundred ninety-nine thousand, four hundred seventy-three".